Long wavelength gravity anomalies over India: Crustal and lithospheric structures and its flexure

Tiwari, V. M.; Kumar, M. Ravi; Mishra, D. C.

doi:10.1016/j.jseaes.2013.03.011

Cited by 27 publications

(16 citation statements)

References 37 publications

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“…1). The western syntaxis is tectonically the most complex where the Indian plate accreted with the Cimmerian terrain and is stacked together along various suture zones with no escape zone and probably represents the westernmost extent of the indenting Indian plate (Patriat & Achache 1984;Burtman & Molnar 1993;Schwab et al 2004;van Hinsbergen et al 2011). These accreted terrain(s)/slabs probably consist exclusively of material of Eurasian provenance (Mechie et al 2012).…”

Section: Regional Tectonicsmentioning

confidence: 99%

“…1) (Burtman & Molnar 1993;Schwab et al 2004;van Hinsbergen et al 2011). To the east of the western syntaxial belt lie the Qiangtang and the Songpan-Ganji terrains of Tibet which are stretched along the Karakoram Fault zone (van Hinsbergen et al 2011).…”

Section: Regional Tectonicsmentioning

confidence: 99%

“…Considering these isostatic studies, we filtered the Bouguer anomaly with a cut-off wavelength of 450 km assuming that some parts of the region show ,50 km of effective elastic thickness and thus less of a roll for the wavelength. Such an approach is used effectively for lithosphere structural mapping (Tiwari et al 2013). …”

Section: Bouguer Anomaly Mapmentioning

confidence: 99%

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The lithospheric density structure below the western Himalayan syntaxis: tectonic implications

Tiwari

Mishra

Pandey

2015

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The differences in the tectonic regimes of the western part of the India -Asia collision zone (western Himalayan syntaxis), consisting of the Ladakh-Karakoram, Hindu Kush and Pamir terrains, are examined through the analyses and modelling of gravity anomalies, computed from global gravity model and terrestrial data. Long-wavelength (.450 km) anomalies are related to isostatic compensation and correspond to topographic variations. The short-wavelength gravity highs are primarily due to upthrust blocks and are mostly linked to crustal seismicity. The intermediate depth-focused earthquake region of Hindu Kush-Pamir is characterized by a gravity low probably caused by crustal underthrusting. The deep density structure of the crust and upper mantle constructed from the modelling of gravity anomalies with constraints from seismological information suggests crustal underthrusting of the Indian and the Asian plates in the Hindu Kush-Pamir section unlike that in the Ladakh-Karakoram region, where underthrust Indian lithosphere underplates beneath the Asian plate. The density model supports a hypothesis of slab breakoff of Indian and Eurasian plates in the Ladakh-Karakoram segment, and of the Indian plate in the Hindu Kush-Pamir region, whereas the Eurasian plate drastically underthrusts deeper (c. 200 km), causing deep seismicity in the Hindu Kush-Pamir section.

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Section: Regional Tectonicsmentioning

confidence: 99%

Section: Regional Tectonicsmentioning

confidence: 99%

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The lithospheric density structure below the western Himalayan syntaxis: tectonic implications

Tiwari

Mishra

Pandey

2015

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“…However, such a map is not adequate enough for present day exploration requirements and was mostly utilized only for regional lithospheric and geodynamic studies (e.g. Tiwari et al, 2013). To improve upon the gravity anomaly maps prepared in seventies and eighties, an effort was made in bringing five major research/government organizations namely CSIR-National Geophysical Research Institute (CSIR-NGRI), Survey of India (SOI), Geological Survey India (GSI), Oil and Natural Gas Corporation (ONGC), Oil India Ltd. (OIL) to collaborate with the primary goal of updating and publishing gravity anomaly map of India from the basic gravity data collected under various projects by these five collaborative organisations.…”

Section: Gravity Datamentioning

confidence: 99%

“…Therefore, knowledge of causative sources of gravity anomalies offers several objectives e.g. exploration of natural resources, lithospheric density structure and deep density anomalies involved in the geodynamic processes (Mishra et al, 2008;Tiwari et al, 2013). Measurements of gravity field are made in combination of absolute and relative measurements.…”

Section: Introductionmentioning

confidence: 99%

Gravity, GPA and Geomagnetic Data in India

Tiwari¹,

Veenadhari²,

Gahalaut³

et al. 2014

Proceedings of the Indian National Science Academy

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Gravity, Global Positioning System (GPS) and Geomagnetic data sets in India are acquired by different research, academic and government institutions, under various projects. These data sets have extensively been utilized for natural resources and lithopsheric explorations, earthquake studies, atmospheric and ionospheric studies, control surveys, aircraft navigation, etc. The data are archived at individual institutions and have different modes of procurement considering some of the data, e.g., gravity data are classified in nature. Some of these data sets are contributed to the international observational network for example IGS and INTERMAGNET and are available as open source for the scientific communities. Present article provides information about different types of available Gravity, GPS and Geomagnetic data, their archival and mode of availability to the user community.

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Possible occurrence of Palaeoarchean ferropicrite cumulates and ferrobasalts in the Jojohatu area of North Singhbhum Craton, eastern India: Evidence for a mantle plume source

et al. 2021

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An occurrence of Palaeoarchaean ferropicrite cumulates and ferrobasalts is being reported from the Jojohatu area of the Iron Ore Group (IOG) greenstone belt, which is situated in the northern part of the Singhbhum Craton (eastern India). The ferropicrite cumulates contain serpentine and clinopyroxene as major constituents and spinel, magnetite, and ilmenite as accessories. Their bulk rock chemistry exhibits an extremely high amount of FeOT (19.0–20.8 wt%) and MgO (22.0–23.9 wt%) and quite low Al2O3 (4.5–5.2 wt%) and Na2O + K2O (<1.0 wt%), thus making them as one of the most Fe‐rich ferropicrite cumulates in the world. They are also characterized by high contents of compatible trace elements (Ni: 986–1,470 ppm; Cr: 990–1,256 ppm) and moderate TiO2 (1.5–1.7 wt%), Nb (15–18 ppm), and Zr (82–90 ppm). These cumulates are possibly formed due to accumulation of olivine from the ferrobasaltic melts. In comparison, ferrobasalts consisting of plagioclase, pyroxene, and opaques are alkaline in nature. Some of the plagioclase and pyroxene grains have shown a signature of metasomatic alteration, which resulted into formation of secondary minerals such as epidote, chlorite, and hornblende. They exhibit relatively low contents of FeOT (14.6–18.4 wt%), MgO (8.4–10.8 wt%), Ni (32–122 ppm), and Cr (41–131 ppm) than the ferropicrite cumulates, while TiO2 (2.9–4.1 wt%), Nb (42–61 ppm), and Zr (216–318 ppm) contents are higher. Incompatible elemental patterns and their ratios, as well as Zr/Y versus Nb/Y plot, indicate their ocean island basalts (OIB) affinity and genesis from a hot mantle plume, having mantle potential temperature of about 1,600°C and pressure of 3.5–5 GPa. Considerably low CaO (3.00–7.16 wt%) and FeO/MgO and CaO/MgO systematics indicate that the primary source of the basaltic melt could be pyroxenite. These volcanic occurrences possibly represent remnants of the OIB formed during the Palaeoarchean in the eastern part of the Indian shield.

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Long wavelength gravity anomalies over India: Crustal and lithospheric structures and its flexure

Cited by 27 publications

References 37 publications

The lithospheric density structure below the western Himalayan syntaxis: tectonic implications

The lithospheric density structure below the western Himalayan syntaxis: tectonic implications

Gravity, GPA and Geomagnetic Data in India

Possible occurrence of Palaeoarchean ferropicrite cumulates and ferrobasalts in the Jojohatu area of North Singhbhum Craton, eastern India: Evidence for a mantle plume source

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